Seasonal variability of phytoplankton populations in the middle Adriatic sub-basin |
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| Authors: | Totti C; Civitarese G; Acri F; Barletta D; Candelari G; Paschini E; Solazzi A |
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| Institution: | 1 Istituto di Scienze del Mare, University of Ancona, Via Brecce Bianche, 60131 Ancona, Istituto Talassografico (CNR), Trieste,
2 Istituto di Biologia del mare (CNR), Venezia and
3 Istituto di Ricerche sulla Pesca Marittima (CNR),Ancona, Italy |
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| Abstract: | The seasonal variability of phytoplankton assemblages in themiddle Adriatic sub-basin is described. The investigated areacrossed the middle Adriatic from the Italian to the Croatiancoasts. Hydrographic data, chlorophyll (Chl) a and phytoplanktonwere collected on a seasonal basis from May 1995 to February1996. Highest phytoplankton densities (up to 6 x 106 cells dm–3)were observed in spring and autumn in the western side, withinthe diluted waters. The vertical distribution of Chl a exhibiteda pronounced subsurface maximum associated, in coastal waters,with micro-planktonic diatoms. Phytoplankton assemblages weredominated by phytoflagellates in all the periods investigated.Diatom maxima were observed in spring and autumn: their verticaldistribution generally reflected the Chl a pattern and in thewestern coastal area peaks are due to large diatom species (Pseudo-nitzschiaspp.). In offshore waters, dinoflagellates strongly prevailover diatoms and provide a relevant contribution to the totalbiomass, especially in highly stratified conditions. Coccolithophoridswere mostly encountered in surface layers and their highestcontribution to the total biomass was observed in the LevantineIntermediate Water. |
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